The zoo keepers is worried because the number of visitors __smaller and smaller

_____ the fans are waiting for the popularsinger outside the concert hall.

下列句子加横线词的用法与例句相同的一项是（ ）例句：园日涉以成趣

has promised to keep the secret, so he won’ttell anyone _____ asked to

How _______ do you chat with your aunt on the Internet?—Now and then, though we don’t have much in common